⚛️ Physics · Motion in a Plane · NEET & JEE

Two trains approach each other on parallel tracks at 80 km/h and 60 km/h. Their relative speed is:

Answer: 140 km/h.

A 20 km/h
B 60 km/h
C 80 km/h
D 140 km/h

Correct answer: D. 140 km/h

Explanation: When approaching, relative speed = sum = 80 + 60 = 140 km/h.

Projectile trajectories launched at 15, 30, 45, 60, 75 and 90 degrees at the same speed, each annotated with range R, maximum height H and time of flight T, with coloured dots marking equal time intervals

Projectiles at equal speed: range is maximum at 45°, and complementary angles (30° and 60°) share the same range. Image: Cmglee, CC BY-SA 3.0, via Wikimedia Commons.

Concept context

Vectors, projectile motion, uniform circular motion, and relative velocity - the foundation of 2D kinematics for NEET and JEE.

Read the full Motion in a Plane notes →

Two trains approach each other on parallel tracks at 80 km/h and 60 km/h. Their relative speed is:

Concept context

More Motion in a Plane questions